Advanced Patterns with io ReadWriter
summary
Shows how to stream and transform byte streams without buffering the whole payload, using io.TeeReader to siphon bytes to an MD5 digest while preserving raw chunks, httputil.NewChunkedReader to detect the zero-length terminator and trailers, and io.Pipe + bufio.Scanner to build a line-prefixing writer that multiplexes long-running subprocess output. Demonstrates trade-offs: one-reader single-copy is faster but more code, the composed approach makes correctness simple, and careless blocking can leak goroutines unless outputs are closed or timeouts applied.
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